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0511sc Vortec 13 Z

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When ordered as an assembled head, the Vortec Bow-Tie comes with the same 1.32-inch-diameter, 332-pound springs that were part of the LT4 engine. With them, the camshaft can't exceed 0.530-inch lift.
The Iron Alternative

 When ordered as an assembled head, the Vortec Bow-Tie comes with the same 1.32-inch-diameter, 332-pound springs that were part of the LT4 engine. With them, the camshaft can't exceed 0.530-inch lift.  View Related Article

 

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